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The European Space Agency’s Rosetta mission was designed to do just that and visiting Comet 67P/Churyumov-Gerasimenko has led to the first-ever discovery of nitrogen emanating from a comet, according to a new report in the journal Science.

The image above shows a Cumulus-nimbus cloud that has an anvil top to it. The reason that can be identified is that the cirrus is in place above the center of the storm. The image below does not have an anvil top yet. The anvil top forms on CB clouds after they reach the height in the atmosphere where they begin to feel the upper level winds becoming too strong for them to continue development vertically. The storm on the right has not felt the upper level winds yet, that is why it lacks the...